The development of insight, according to the suttas and commentaries, requires a high degree of samadhi (but not necessarily jhana):
http://www.dhammawheel.com/viewtopic.ph ... 07#p244480
And, as I've quoted before:“The words ‘insight alone’ are meant to exclude not virtue, etc., but serenity (i.e.
jhána), which is the opposite number in the pair, serenity and insight. This is for
emphasis. But the word ‘alone’ actually excludes only that concentration with distinction
[of jhána]; for concentration is classed as both access and absorption (see IV.32). Taking this stanza as the teaching for one whose vehicle is insight does not imply that there is no concentration; for no insight comes about without momentary concentration. And again, insight should be understood as the three contemplations of impermanence,
pain, and not-self; not contemplation of impermanence alone” (Vism-mhþ 9–10).
This is what Dan, and other's, are getting at. Sati and samadhi are necessary conditions for vipassana."In a person of right view, right resolve comes into being. In a person of right resolve, right speech. In a person of right speech, right action. In a person of right action, right livelihood. In a person of right livelihood, right effort. In a person of right effort, right mindfulness. In a person of right mindfulness, right concentration. In a person of right concentration, right knowledge. In a person of right knowledge, right release.
http://www.accesstoinsight.org/tipitaka ... .than.html
[Both, of course, as everyone here has stated many times, arise with right view as a condition.]
Mike